Class DeflaterInputStream
java.lang.Object
java.io.InputStream
java.io.FilterInputStream
java.util.zip.DeflaterInputStream
- All Implemented Interfaces:
Closeable,AutoCloseable
Implements an input stream filter for compressing data in the "deflate"
compression format.
- Since:
- 1.6
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected final byte[]Input buffer for reading compressed data.protected final DeflaterCompressor for this stream.Fields declared in class java.io.FilterInputStream
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Constructor Summary
ConstructorsConstructorDescriptionCreates a new input stream with a default compressor and buffer size.DeflaterInputStream(InputStream in, Deflater defl) Creates a new input stream with the specified compressor and a default buffer size.DeflaterInputStream(InputStream in, Deflater defl, int bufLen) Creates a new input stream with the specified compressor and buffer size. -
Method Summary
Modifier and TypeMethodDescriptionintReturns 0 after EOF has been reached, otherwise always return 1.voidclose()Closes this input stream and its underlying input stream, discarding any pending uncompressed data.voidmark(int limit) This operation is not supported.booleanintread()Reads a single byte of compressed data from the input stream.intread(byte[] b, int off, int len) Reads compressed data into a byte array.voidreset()This operation is not supported.longskip(long n) Skips over and discards data from the input stream.Methods declared in class java.io.FilterInputStream
readMethods declared in class java.io.InputStream
nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo
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Field Details
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def
Compressor for this stream. -
buf
protected final byte[] bufInput buffer for reading compressed data.
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Constructor Details
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DeflaterInputStream
Creates a new input stream with a default compressor and buffer size.- Parameters:
in- input stream to read the uncompressed data to- Throws:
NullPointerException- ifinis null
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DeflaterInputStream
Creates a new input stream with the specified compressor and a default buffer size.- Parameters:
in- input stream to read the uncompressed data todefl- compressor ("deflater") for this stream- Throws:
NullPointerException- ifinordeflis null
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DeflaterInputStream
Creates a new input stream with the specified compressor and buffer size.- Parameters:
in- input stream to read the uncompressed data todefl- compressor ("deflater") for this streambufLen- compression buffer size- Throws:
IllegalArgumentException- ifbufLen <= 0NullPointerException- ifinordeflis null
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Method Details
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close
Closes this input stream and its underlying input stream, discarding any pending uncompressed data.- Specified by:
closein interfaceAutoCloseable- Specified by:
closein interfaceCloseable- Overrides:
closein classFilterInputStream- Throws:
IOException- if an I/O error occurs- See Also:
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read
Reads a single byte of compressed data from the input stream. This method will block until some input can be read and compressed.- Overrides:
readin classFilterInputStream- Returns:
- a single byte of compressed data, or -1 if the end of the uncompressed input stream is reached
- Throws:
IOException- if an I/O error occurs or if this stream is already closed- See Also:
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read
Reads compressed data into a byte array. This method will block until some input can be read and compressed.- Overrides:
readin classFilterInputStream- Parameters:
b- buffer into which the data is readoff- starting offset of the data withinblen- maximum number of compressed bytes to read intob- Returns:
- the actual number of bytes read, or -1 if the end of the uncompressed input stream is reached
- Throws:
NullPointerException- ifbis nullIndexOutOfBoundsException- iflen > b.length - offIOException- if an I/O error occurs or if this input stream is already closed- See Also:
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skip
Skips over and discards data from the input stream. This method may block until the specified number of bytes are skipped or end of stream is reached.- Overrides:
skipin classFilterInputStream- Implementation Note:
- This method skips at most
Integer.MAX_VALUEbytes. - Parameters:
n- number of bytes to be skipped. Ifnis zero then no bytes are skipped.- Returns:
- the actual number of bytes skipped, which might be zero
- Throws:
IOException- if an I/O error occurs or if this stream is already closedIllegalArgumentException- ifn < 0- See Also:
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available
Returns 0 after EOF has been reached, otherwise always return 1.Programs should not count on this method to return the actual number of bytes that could be read without blocking
- Overrides:
availablein classFilterInputStream- Returns:
- zero after the end of the underlying input stream has been reached, otherwise always returns 1
- Throws:
IOException- if an I/O error occurs or if this stream is already closed
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markSupported
public boolean markSupported()- Overrides:
markSupportedin classFilterInputStream- Returns:
- false, always
- See Also:
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mark
public void mark(int limit) This operation is not supported.- Overrides:
markin classFilterInputStream- Parameters:
limit- maximum bytes that can be read before invalidating the position marker- See Also:
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reset
This operation is not supported.- Overrides:
resetin classFilterInputStream- Throws:
IOException- always thrown- See Also:
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